git-send-email: refactor duplicate $? checks into a function

Refactor the duplicate checking of $? into a function. There's an
outstanding series[1] wanting to add a third use of system() in this
file, let's not copy this boilerplate anymore when that happens.

1. http://lore.kernel.org/git/87y2esg22j.fsf@evledraar.gmail.com

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: avar

git-send-email.perl

@@ -212,22 +212,31 @@ sub format_2822_time {
 my $multiedit;
 my $editor;
 
+sub system_or_msg {
+	my ($args, $msg) = @_;
+	system(@$args);
+	my $signalled = $? & 127;
+	my $exit_code = $? >> 8;
+	return unless $signalled or $exit_code;
+
+	return sprintf(__("failed to run command %s, died with code %d"),
+		       "@$args", $exit_code);
+}
+
+sub system_or_die {
+	my $msg = system_or_msg(@_);
+	die $msg if $msg;
+}
+
 sub do_edit {
 	if (!defined($editor)) {
 		$editor = Git::command_oneline('var', 'GIT_EDITOR');
 	}
+	my $die_msg = __("the editor exited uncleanly, aborting everything");
 	if (defined($multiedit) && !$multiedit) {
-		for (@_) {
-			system('sh', '-c', $editor.' "$@"', $editor, $_);
-			if (($? & 127) || ($? >> 8)) {
-				die(__("the editor exited uncleanly, aborting everything"));
-			}
-		}
+		system_or_die(['sh', '-c', $editor.' "$@"', $editor, $_], $die_msg) for @_;
 	} else {
-		system('sh', '-c', $editor.' "$@"', $editor, @_);
-		if (($? & 127) || ($? >> 8)) {
-			die(__("the editor exited uncleanly, aborting everything"));
-		}
+		system_or_die(['sh', '-c', $editor.' "$@"', $editor, @_], $die_msg);
 	}
 }
 
@@ -698,9 +707,7 @@ sub is_format_patch_arg {
 if ($validate) {
 	foreach my $f (@files) {
 		unless (-p $f) {
-			my $error = validate_patch($f, $target_xfer_encoding);
-			$error and die sprintf(__("fatal: %s: %s\nwarning: no patches were sent\n"),
-						  $f, $error);
+			validate_patch($f, $target_xfer_encoding);
 		}
 	}
 }
@@ -1952,11 +1959,13 @@ sub validate_patch {
 			chdir($repo->wc_path() or $repo->repo_path())
 				or die("chdir: $!");
 			local $ENV{"GIT_DIR"} = $repo->repo_path();
-			$hook_error = "rejected by sendemail-validate hook"
-				if system($validate_hook, $target);
+			$hook_error = system_or_msg([$validate_hook, $target]);
 			chdir($cwd_save) or die("chdir: $!");
 		}
-		return $hook_error if $hook_error;
+		if ($hook_error) {
+			die sprintf(__("fatal: %s: rejected by sendemail-validate hook\n" .
+				       "warning: no patches were sent\n"), $fn);
+		}
 	}
 
 	# Any long lines will be automatically fixed if we use a suitable transfer
@@ -1966,7 +1975,9 @@ sub validate_patch {
 			or die sprintf(__("unable to open %s: %s\n"), $fn, $!);
 		while (my $line = <$fh>) {
 			if (length($line) > 998) {
-				return sprintf(__("%s: patch contains a line longer than 998 characters"), $.);
+				die sprintf(__("fatal: %s: %d: patch contains a line longer than 998 characters\n" .
+					       "warning: no patches were sent\n"),
+					    $fn, $.);
 			}
 		}
 	}